Stump-pulling machine



Sept. 4, 1928.

s, L. LUEBBERS STUMP PULLING MACHINE m Filed May 20, 1927 2 Sheets-Sheet 1 In vsnron Sept. 4, 192a 1,682,973

G. L. LUEBBERS STUMP PULLING MACHINE In mm for.

Patented Sept. 4, 1928.

UNITED STA E caries.

seer/meantime enemas.

atpneeti'dn tried my 20, 1532?. serial nor-192,969.

The invention relates to a new and imroved forfn of stump puller in which a heavy weight is suspended in p'e'ndular man her here a stita'bl'e overhanging portable;

frantic,- with means provided to raise and suddenly release such weight from any de sired height, which said Weight being connected at approximately its center of gravity by means of a wire rope or chain to" the stump to be extracted strikessa'me a sud den and heavy blow in a horizontal direc tion with thefollowing' useful and beneficial results: I r

1. The stump is speedily and cheaply extracteid. v

2; Due to the sudden'ja-r much or all of the extraneous matter clinging to the stump is removed hich aids materially in disposing of the same.

It should further be noted that no anchoring of this machine is require l -fa great saving in time and labor; Also that the force applied to the" stump by this machine conforms fittin-gly to that required for its extraction being a maximum at the begin ni-ng of as application, as is also required to breakloose or dislodge the stump.

One form of the machine is illustrated in the accompanying drawings; in which Figure 1 is a side elevation of the entire machine with connection made to a stump;

Figure 2 is horizontal section along the line's- 2 shown in' Figure 1; Figur'c' '8' is a rear elevation of the trip-hoolt used; Fi as are a is as see elevation of the trip-liooli,

Figure 5 is an end elevation of the entire machine, Figure 6" is detailed view of one of the snub'ber side springs complete with connecting ro'ds'and Figure 7 is a plan view The folir theme 3 connected to the two parallel skids 1 by means of the foot-pieces 2 are brought together at their upper ends and connected to the casting 6, and constrained to their proper relative positions by the oblong angle frame 4: and the diagonal braces 5, which said diagonal braces 5 are connected at their eye ends by the hanger 11 which passes thru the eyes of the braces 5, the braces 5 being super-imposed the one on the other at this end as shown in Figure 2, the whole forming a rigid and strong frame of an arched pyramidal shape which is portable. The heavy weight 9 is suspended principally from the apex of this frame by means of the hanger 10, which of the entire machine connected to a stu-Inp.

has at its upper end engaging with the eye of the hanger 11, which hanger 11 passes thru the eyes of the diagonal braces 5 being thereby held in a position central with the frame and is attached to the casting 6 by means of screw threads and a nut; The hangerll having a shoulder. just below the casting 6 allows the nut to be" screwed down firmly. A further means of suspension of the weight 9 are the extensible snnbb'er side spring assemblies shown in Fig ure of which one is provided on either side of the weight 9' and connected as follows: The eye-studs 12 are screwed into the weight 9 and o'ined to the eye-bars 13 which pass centrally thru the circular caps 14: and the spring 15, having screw-threads and a nut at their upper ends; The U-b'ars 16 having screw threads and nuts at their lower ends also pass thru the circular caps 14; and the spring 15 and are connected at ther upper ends through the grooved bushings 28, the pins 17. and the castings 18 to the oblong angle frame 41.

t will bescen from the above that the weight 9, together with its'hanger l0, and the two side snubber spring assemblies complete, is free to swing in a pendular manher in an arc whose plane is vertical, parallel to the skids 1 and central between them.

Means for lifting and releasing the weight on the outer end of the angle bar 7 and the other connected to the weight 9 by means of the trip hook 20 and the eye-stud 25. By drawing on the tackle rope 21 the weight 9 will be raised to an elevated position as shown in outline in Figure 1 and released for theblow by means of the trip-hook 20, which will now be described.

Referring to Figures 3 and 4 the hook 29 is free to rotate bctweenthe side pieces 30 around the pin 31. .VVhen lifting a load it is constrained by the trip 33 which engages with its longer point as shown, but the trip 38 being capable of rotation'about a pin 32 may be pulled into the position shown in outline, thereby releasing the load, it

' plained.

should be noted that due to the fact that the point of bearinw of the load being close to the pin Ell which is the center of rotation of the hook 29, the force'required to keep the hook 29 locked in position isrelativel small at the point of engagement with t e trip 33, so that a relatively small pull on 'the trip rope 26 is all that is necessary to disengage the hook. The linlt34c, suspended from thepin 85, permits the suspension of the trip hook 20 to the pulley block 19..

It will be noticed fromFigure 1 that the hanger 10 passes thruthe weight'9 and has screw-threads and a nut counter-sunk into gravity of the weight danger of a foul blowis diminished.

Having thus described the construction of the machine its operation will now be ex- The entire machine is drawn preferably some distance ahead of the stump to be extracted and lined so that the stump is approximately in the plane of the blow.

The arched structural shape allowspassing over obstructions if desired. The wire rope or chain 23 is. connected to the stump 24: and its length so adjusted that the wire rope or chain 23v is taut when'the weight 9 hangs vertically downward. The tackle having been adjusted as shown in Figure 1 the trip rope 26' may be adjusted to such length as in the judgmentv of the operator may be required to obtain the necessary strength "of blow. By drawing now on the tackle. rope 21 which passes thru the pulley blocks22 andJQtheXWnghtQ WHIberaEedlnmflthe trip-rope 26 trips the trip-hook 20 and the weight 9 descends, and because of its connection to the stump 24, strikes the latter a powerful blow-ina horizontal direction.

Ifinsuflicient to extract the stump the blow may be repeated.

As will inevitably occuriat times, if the stump be] not exactly in the plane of the blow the weight .9 will .be deflected to one side an amount depending on the force of theblow and the amount of variation from the plane of the blow, In such case the snubber springs will come into action and will tend-gradually to return the weight 9 to its normal central position Without subjecting the frame to excessive. strain.

It is obviousthat there may be consider,- able variation in the design "and materials used in the construction of the frame, the weight, its means of suspension,raising, releasing, snuhbing and attachment tothe stump, without .in any way departing from. the principal idea of my invention and I do not therefore limit myself exclusively to the design describedlexcept as hereinafter noted. i

I claim:

A stump puller including a portable frame comprising a structural support and skids upon which said suPPortis mounted, aheavy weight suspended from the upper portion of said structural support in a central position, said weight having an approximately funnel-shaped-Opening for the admittance and unimpeded action of a rope or chain connecting the stump to be extracted and thehanger passing thru said Weight,-two extensible elements comprising each a spring constrained between two cap plates with two draw-bars and their connections, each extensible element beingsuspended from opposite sides of the structural frame and attached at their. lower ends to the above pendular element comprising a structural extension of themain structural frame, a

multiple pulley block depending therefrom,

a simil'ar multiple pulley block attached to said weight, and a rope threaded thru said pulley blocks, meansfor suddenly releasing said pendular element consisting of] a trip hook and trip rope.

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